I build complete products
Not just screens: I think through flows, data, release, support, and how a solution holds up once users have it.
Software developer open to remote work
Gustavo Valera
Full Stack Developer | Android | Next.js | Kotlin
I build real apps, platforms, and tools: from idea, architecture, and user experience to release, monetization, support, and continuous improvement.
DevKratos
I build products ready to be used
Experience building Android apps with Kotlin, Jetpack Compose, and Google Play release workflows.
I develop web platforms with Next.js, React, TypeScript, APIs, and deployment.
Product mindset: privacy, monetization, support, analytics, and scalability.
Value proposition
Why work with me
I can move across product, frontend, mobile, backend, and real service integrations. I care about building solutions that work outside the development environment.
Real mobile experience
I work with Android, Kotlin, Jetpack Compose, Google Play Console, Billing, AdMob, Firebase Analytics, and Crashlytics.
Modern web platforms
I develop with Next.js, React, TypeScript, Tailwind, Supabase, PostgreSQL, APIs, and deployments prepared to grow.
Product mindset
I consider monetization, privacy, maintenance, scalability, and clarity for end users or business teams.
Featured projects
Real work, not just exercises
These projects show my ability to build apps, platforms, and systems with practical product decisions.
HandyKit
Internal testingAndroid utilities app, formerly CellTools, built with Kotlin and Jetpack Compose and prepared for Google Play with monetization, analytics, and support.
AndroidKotlinJetpack ComposeGoogle PlayAdMobBillingFirebase
Yupilupa
In developmentMarketplace and local commerce platform with catalog, business architecture, and backend/API prepared for growth.
Next.jsTypeScriptBackend/APICatalogLocal commerce
Products API
In developmentCentralized catalog with Supabase, PostgreSQL, and Storage to manage products and serve data to commerce platforms.
Next.jsSupabasePostgreSQLStorageREST APIs
DevKratos Web
ActiveCommercial and professional site with i18n, SEO, accessibility, responsive design, and a conversion-focused diagnosis flow.
Next.jsReactTailwindnext-intlSEOAccessibility
Technical stack
Tools I build with
My focus is on technologies that help take an idea into a publishable app, platform, or tool.
Frontend
Next.jsReactTypeScriptTailwind
Mobile
KotlinJetpack ComposeAndroidGoogle Play Console
Backend/Data
SupabasePostgreSQLREST APIsStorage
Product/Infra
FirebaseAdMobPlay BillingVercelGitHub
Freelance services
I also build websites and digital solutions for businesses.
DevKratos' current commercial offer remains available for businesses that need a professional presence, more trust, and a clear path to WhatsApp.
Contact
Looking for a remote developer who can build and publish real products?
I am open to remote opportunities and also to well-defined freelance projects. You can reach out about a role, an app, or a digital solution.